Securing an enclosed area

ABSTRACT

A security apparatus ( 10 ) is provided in an enclosed area to be secured against an external threat, e.g. a load volume of a vehicle transporting valuables is secured against unauthorized entry. Two chemical components are contained separately. When a danger situation occurs, the security apparatus ( 10 ) is actuated via control means to expose the chemical components to each other and to mix them. After a predetermined, short, time period, the mixture is released and is distributed over the area being secured. Foaming and solidification take place in short time to occupy the enclosed area and to prevent entry and exit.

THIS INVENTION relates to a method of and apparatus for securing anenclosed area against an external threat, e.g. against unauthorisedentry.

The Applicant envisages that this invention will be particularlyadvantageously applicable to securing an enclosed volume in a vehicleagainst an external threat, e.g. against unauthorised entry, with a viewto securing valuables, e.g. cash, in transit in the vehicle. Thatapplication will predominantly be borne in mind for purposes of thisspecification. The invention is, however, not limited to thatapplication.

In accordance with a first aspect of this invention, there is provided amethod of securing an enclosed area against an external threat, forexample against unauthorised entry, the method including

-   -   selectively mixing, for a predetermined short period, a        plurality of predetermined liquid chemical components, the        components being adapted, when mixed, in short time, to foam, to        expand and to set;    -   distributing the mixture while substantially in liquid state and        substantially before foaming commences, over the area;    -   allowing the mixture to foam at least partially to occupy the        area, to set, and to block the area against entry or exit.

The method may include containing the respective liquid chemicalcomponents in separate compartments of a composite container, andexposing the components to each other or intercommunicating thecompartments as a first step of mixing. Exposing the components to eachother or intercommunicating the compartments may include forcefullybreaching a division means between the compartments. Forcefullybreaching the division means may be by moving or removing or breaking adivision or divider between the compartments.

One species of method may include actuating electrical mixing means tocommence mixing. In that species of method, actuating may includedriving a ram through the division means to break it.

Another species of method may include actuating a detonator arranged tofracture the division means. That species of method may advantageouslyinclude pressurizing a respective compartment with pressure generated bythe detonator to blow the division means out of its position.

Generally, in accordance with the method of the invention, when saidseparate compartments are adjacent a mixing chamber, the method mayinclude causing the respective chemical components to flow into themixing chamber, mixing taking place within the mixing chamber. Themethod may include mixing the liquid components by stirring. Stirring inthe mixing chamber may be by means of a stirrer, conveniently in theform of a rotor.

The method may include, after a predetermined time period from the timeof actuation, discharging the mixture from the container or the mixingchamber to distribute it over the area. Discharging the mixture from thecontainer or the mixing chamber may include breaching a wall portion ofthe container or mixing chamber. The wall portion may conveniently befrangible and the method may thus include fracturing the wall portion,for example by releasing a pre-tensioned spring arranged to drive afracturing member into said frangible wall portion. Instead, the wallportion may be fractured by detonating a detonator arranged to fracturethe wall portion. Detonating the detonator may be such as to pressurisean area behind the wall portion with pressure generated by the detonatorand to drive the wall portion from its position. The method may theninclude expelling the liquid mixture under pressure from the containeror mixing chamber.

By way of development, the method may include hindering or retardingentry into the enclosed area by deploying a collapsible and extensiblebarricade member in the enclosed area by moving the barricade memberfrom a collapsed condition in a stowed position to an extended conditionin a deployed position in respect of the enclosed area.

Advantageously, mixing the plurality of liquid chemical components anddeploying the barricade member may be in response to a signal generatedby control means. The control means may generate said signal in responseto manual actuation or automatically in response to a sensor sensing adanger situation. When said enclosed area is a load area of a vehicle,said sensor may be arranged to be triggered by impact, such as impactoccurring during an accident.

In accordance with a second aspect of this invention, there is provideda securing arrangement suitable for use in securing an enclosed areaagainst external threat such as against unauthorized entry, the securingarrangement comprising

-   -   a composite container including separate compartments        respectively containing liquid chemical components adapted, when        mixed, in short time, to foam, to expand and to set;    -   division means between the compartments which division means is        readily breachable to intercommunicate the compartments;    -   mixing means to mix the liquid chemical components; and    -   control means to cause mixing for a predetermined period and        then to cause the mixture to be discharged while substantially        still in a liquid state prior to foaming.

In one species of embodiment, the mixing means may include a shaftcarrying a stirring head and being drivingly connected to a rotarymotor, advantageously a direct current electric motor, which may, forexample, be powered from a battery of electrical cells, e.g. a motorvehicle battery.

Advantageously, the shaft may be extensible to act as a ram to breachthe division means. The shaft may be in two portions which areinterconnected by means of a bendix drive to extend one portion to actas a ram.

The separate compartments for the respective chemical liquids may beadjacent a mixing chamber and may be compartmentalized by means offrangible division means dividing the compartments and the mixingchamber. Then, the securing arrangement may include detonators arranged,when actuated, to fracture the division means to communicate thecompartments with the mixing chamber. Advantageously, the detonators maybe arranged to pressurize the compartments to blow the respectivedivision means out of their positions.

The arrangement of the respective compartments adjacent the mixingchamber may advantageously be such that said division means preventsintercommunication, and such that the respective compartments dump theircontents into the mixing chamber when the division means is breached andthe compartments are pressurized.

Generally, the composite container may have a discharge gate todischarge the liquid after mixing has taken place and prior tocommencement of substantial foaming. The discharge gate may be in theform of a frangible division in the form of a wall portion of thecontainer, the securing arrangement including breaking means to fracturethe division.

In one species of embodiment, the breaking means may be in the form of aspring biassed lever, which is released by means of the control means.In use, when released, the lever will be propelled by means of itsspring bias to impinge on and fracture the division.

Instead, the breaking means may include one or more detonators actuableby means of the control means and arranged to fracture the division whenactuated. The detonators may be arranged, when actuated, to pressurizethe mixing chamber to blow the fractured division out of its position.

Generally, the control means may be adapted to actuate the mixing meansand the breaking means, the control means being triggerable selectivelyor when a predetermined danger situation arises.

The control means may be electrical. The control means may include atime delay means or component adapted to actuate the breaking means apredetermined time period after actuation has commenced, to dischargethe mixture before substantial foaming commences.

In a preferred application, the enclosed area may be a load area of avehicle. Then, the control means may be triggerable in the event of anaccident involving the vehicle.

By way of development, the securing arrangement may include hindering orretarding means suitable for use in hindering or retarding unauthorisedentry into the enclosed area, the hindering or retarding means including

-   -   a collapsible and extensible barricade member movable between a        stowed condition in which it is stowed in its collapsed        condition, and a deployed condition in which it is deployed in        its extended condition;    -   deployment means adapted to move the barricade member rapidly        from its stowed to its deployed condition; and    -   a trigger adapted to trigger the deployment means.

In use, the barricade member will hinder or retard entry to allow thechemical mixture sufficient time to be formed, to foam, to expand and toset.

The barricade member may be in the form of one or more rolls ofresilient barbed or prickled wire.

The deployment means may then be provided at least partially by inherentresilience of the wire. Instead, or in addition, the deployment meansmay include resilient bias means to cast the barricade member into apredetermined direction. The securing arrangement may then include ashutter arranged to hold the barricade member against resilient bias inits stowed condition, the trigger being connected to the shutter to openthe shutter or to allow the shutter to open.

In an advantageous application, the enclosed area may be a load area ofa vehicle and the trigger may be a composite trigger allowing manualoperation, and also being automatically operable when an accidentsituation involving the vehicle takes place. Thus, the securingarrangement may include an automatic trigger means responsive to highimpact.

The invention is now described by way of example with reference to theaccompanying diagrammatic drawings. In the drawings

FIG. 1 shows, in axial section, a first embodiment of security apparatusin accordance with the invention;

FIG. 2 shows, in three dimensional view, a variation of the firstembodiment of security apparatus in accordance with the invention;

FIG. 3 shows, in three dimensional rear view, a security vehicle inaccordance with the invention;

FIG. 4 shows, in three dimensional view, a third embodiment of securityapparatus in accordance with the invention; and

FIG. 5 shows a view corresponding to FIG. 4 but in exploded format.

With reference to FIG. 1 of the drawings, a security apparatus inaccordance with the invention and in the form of a foam generator, isgenerally indicated by reference numeral 10. The foam generator 10 isintended to be installed in an area which is to be secured against anexternal threat, e.g. against unauthorised entry. Such an area may,advantageously, be a load compartment of a vehicle such as the securityvehicle of FIG. 3.

The foam generator 10 comprises a composite container 12 which, in thisembodiment, is in the form of a drum or barrel having two separatecompartments superimposed on each other. A first compartment 14 isdirectly above a second compartment 16, and the first and secondcompartments are compartmentalized by means of a glass division 18. Theglass division 18 may have one or more score lines to render it easilyfrangible. Similarly, a bottom of the container 12 is formed by a glasspartition 20 which, likewise, may have one or more score lines to renderit easily frangible. Instead, the divisions or partitions may each be ofa material (e.g. an appropriate type of glass) which is easilyfrangible, e.g. without lines or areas of weakness having to beprovided. In use, chemical components are contained in the respectivecompartments. The chemical components are adapted, when mixed, to foam,to expand and to set in short time.

The composite container 12 has, installed therein, mixing meansgenerally indicated by reference numeral 22. The mixing means 22 isconveniently mounted on an upper lid or cover 23. The mixing means 22comprises an electric motor 24 which is conveniently a direct currentelectric motor operable from 12V or 24V such that it is directlyconnectable to an electrical system of a security vehicle. The mixingmeans 22 further comprises a composite shaft 26 comprising a fixedsection 28 drivingly connected to the electric motor 24, an extensiblesection 30 in series with the fixed section 28, and a bendix drive 32drivingly and extensible interconnecting the extensible section 30 tothe fixed section 28. The mixing means 22 further comprises a stirrer ormixing rotor 34 carried at a free end of the extensible section 30.Instead of rendering the shaft extensible and rendering the drive meanssuitable to extend the shaft, ram-fashion, other appropriate andadvantageous means may be employed to inter-communicate the partitions.Such means may be separate from the rotary drive means of the stirrer orrotor.

The foam generator 10 further comprises breaking means generallyindicated by reference numeral 36. The breaking means 36 is associatedwith the bottom glass partition 20. It comprises a lever 38 pivoted atone position on the periphery of the container 12 as indicated as byreference numeral 40 and extending generally diametrically below thebottom of the container 12. At a free end thereof, it is connected to anupwardly extending shaft 44 extending alongside a periphery of thecomposite container 12. The shaft 44 extends through a trigger mechanism48 and through a coil spring 46 acting in compression between thetrigger mechanism 48 and a stop at the end of the shaft 44. In use, whenthe trigger mechanism 48 is released, the shaft 44 is driven upwardly asshown at 47 by means of the coil spring 46 such that protrusions 42provided for that purpose on the lever 38 impinge on the glass partition20 to break it. In other embodiments, discharge of the mixture prior tofoaming may be achieved by other breaking and discharging means.

In use, when a threatening situation happens, or is developing, thesecurity apparatus 10 is actuated. This can be effected manually, forexample by a driver of the security vehicle, or it can happenautomatically, for example in response to impact such as impact due to acollision.

When actuated, the electric motor 24 rotates the shaft 26. The bendixdrive 32, in known manner, extends the extensible section 30 such thatthe shaft 26 acts as a ram, impinges on the glass division 18 and breaksthe glass division 18. It extends further to a position shown in dotted34 i.e. within the second compartment. The rotor or stirrer 34 isrotated. The first chemical component in the first compartment 14 andthe second chemical component in the second compartment 16 arecommunicated, and are thoroughly mixed by means of the stirrer 34. It isto be appreciated that the direct current electric motor 24 can be ofrelatively high power as, as will appear below, it is not required tooperate for very long. It may, for example, be similar to or even be astarter motor of a vehicle.

The chemical components are thoroughly mixed for a short, predeterminedtime. After said predetermined time from actuating the securityapparatus, the trigger mechanism 48 is triggered to break the glasspartition 20 as explained above. The predetermined time period will bein the order of about ten to fifteen seconds and it is emphasised that,when the security apparatus is actuated, a time delay mechanism issimultaneously actuated. The time delay mechanism will be adapted togenerate a signal after said predetermined time period to actuate thetrigger mechanism 48.

The predetermined time delay period is calculated to ensure that thechemical components are thoroughly mixed, and that the mixture is stillin liquid state i.e. prior to foaming taking place.

When the glass partition 20 is broken, the mixture in liquid state isdischarged from the composite container 12 over the area to be secured.The predetermined time period is calculated also such that, immediatelyafter discharge, foaming will commence to cause foam at least partiallyto fill the area to be secured. As mentioned above, the foam veryquickly, in seconds, starts to solidify and to set and become hard inshort time. Thus, entry into (and exit from) the area to be secured isprevented.

With reference to FIG. 2, another embodiment of security apparatussimilar to the security apparatus 10 is generally indicated by referencenumeral 110. The security apparatus 110 is of polygonal section, forexample hexagonal, or octagonal. One of its sides indicated by referencenumeral 120 forms a discharge gate instead of the frangible partition 20of the embodiment of FIG. 1. The side 120 is hinged and can be openedunder resilient bias or the like.

With reference to FIG. 3, a security vehicle in accordance with theinvention is generally indicated by reference numeral 50. It has a loadcompartment 52 for transport of articles, such as valuables, for examplecash. In the context of this invention, the load compartment 52 is anenclosed area which is secured in accordance with the invention.

In the embodiment of FIG. 3, the load compartment 52 is secured by meansof one or more rolls of barbed or prickled wire. It is shown that such aroll or rolls of barbed or prickled wire, indicated by reference numeral54, are stowed in collapsed condition in a compartment in or against aroof of the load compartment 52. (The rolls are collapsed or compressedin a transverse direction to become generally elongate planar.) In use,automatically when a threatening situation comes about or is developing,or selectively, or by any one of automatically or selectively, thecompartment can be opened e.g. a shutter forming a door of thecompartment can be swung open or pulled away sluice fashion, to allowthe roll or rolls of wire, under inherent resilience of the wire, to becast across a floor of the load compartment 52 to form a barricadeagainst entry of the load compartment.

If desired, one or more rolls of barbed or prickled wire can be providedagainst a front end of the load compartment 52 as indicated by referencenumeral 154, or against a rear end of the load compartment as indicatedby reference numeral 254. The rolls are shown to be collapsed orcompressed in an axial direction. Yet a further option would be tocollapse or compress the rolls axially and stowing them in the roof toallow them to be deployed in column-format.

It is to be appreciated that, instead of the roll or rolls of barbed ofprickled wire, the security device 10 or the security device 110 orsimilar security device in accordance with the invention, can beinstalled in the load compartment 52 to secure the load compartment byat least partially filling it with expandable and setable foam asdescribed above. Advantageously, the security apparatus may be mountedon a gimbal to ensure that it remains upright and that its dischargeopening will appropriately discharge and distribute the liquid aftermixing and before foaming.

By way of development, both the roll or rolls of barbed or prickled wireand the security device in accordance with the invention can be providedin the load compartment 52 such that both systems are operable to securethe load compartment. In such an embodiment, the barbed or prickled wirewill immediately bar access to the load compartment to hinderunauthorised entry to allow the security apparatus or foam generator 10sufficient time to generate foam and for the foam to start solidifyingand to start setting, further to secure the load compartment.

It is regarded as a first advantage that a relatively simple system i.e.the system illustrated in FIG. 3, is provided to hinder or retard entryinto an enclosed area to be secured to allow other measures to be putinto place to prevent or stop unauthorised entry. It is emphasised thatsuch a simple system will be used where articles which are of value, butnot considerable value, such as small amounts of cash, are transported.

It is a further advantage that a more elaborate and more effectivesystem, namely the system illustrated in FIG. 1, is provided, moreeffectively to secure an enclosed area against unauthorised entry.

It is yet a further advantage that the systems disclosed herein can beused in conjunction to form a very effective composite system to securean enclosed area against unauthorised entry.

It is emphasized that this invention will be particulary effective tosecure large amounts of cash in transit.

With reference to FIGS. 4 and 5, a third embodiment of securityapparatus in accordance with this invention is generally indicated byreference numeral 210. The embodiment 210 includes many of the featuresof the embodiment of claim 1, and, where applicable, like referencenumerals are used to denote like components or features.

The embodiment of FIGS. 4 and 5 further has generally the sameadvantages as those described with reference to FIG. 1, and it includesalso further advantages which will be mentioned, by way of example,herebelow.

The security apparatus 210 is in the form of a foam generator having acentral mixing chamber 216 flanked by compartments 214 which are mirrorimages for practical purposes and of which only one will be described.The mixing chamber 216 and the compartments 214 are interconnected andthe unit can releasably be secured, for example, internally of a roof ofa vehicle by means of apertured lugs provided for that purpose at sidesof the compartments 214.

The mixing chamber 216 has an interior 250. Within the interior 250, astirrer 234 is rotatably supported in bushes or bearings. At one end ofthe mixing chamber 216, it has a recessed hollow which houses anelectric motor 234 drivingly connected to a shaft 228 of the stirrer234. The electric motor 234 is mounted in the hollow by means of amounting gland 235. In use, the electric motor 234 is electricallyconnected by means of a circuit including control means in accordancewith the invention to a battery, for example a battery of a vehiclewithin which the security apparatus 210 may be used.

The mixing chamber 216 is generally of elongate box shape. In sidesthereof, it has large openings 252 framed by peripheral frames 254.

In the floor of the mixing chamber 216, it has a large opening 220.

In the floor of the mixing chamber 216, there are provided two sockets237 respectively toward opposed ends of the mixing chamber 216 withinwhich sockets 237 detonators 236 are provided.

Each compartment 214, of which one only is described, has a lateralopening 256 in a side thereof. The opening 256 corresponds to one of theopenings 252 of the mixing chamber 216. The compartment 214 includes aperipheral flange framing the opening 256 and defining, at the peripheryof the opening 256, a recessed peripheral seat 260 for a glasspartition, the position of which is shown at 218 in FIG. 4.

The compartment 214 is replaceably mounted via its flange 258 to oneside of the mixing chamber 216. The other compartment 214 is mounted inlike fashion to an opposed side of the mixing chamber 216.

The mixing chamber 214 includes a recessed cubby 262 in a top thereof.The recess cubby 262 has a pair of ports 264 and houses a pair ofdetonators 232. A cover 263 is removably screwable over an open top ofthe cubby 262.

At one end of the compartment 214, it has a charge opening 266 on whicha flanged collar 268 is screwed. A lid 270 is replaceably securable onthe collar 268.

The compartments 214 are charged via the lids 270 with the predeterminedchemicals.

In use, when a danger or accident situation occurs, and the controlmeans is triggered, either selectively or automatically, for example byimpact, the detonators 232 in the cubbies 262 are detonated. Detonationfractures the glass panels 218 and the respective compartments 214 arecommunicated with the mixing chamber via the openings 256, 252. Thepressure of detonation of the detonators 232 blasts the contents of thecompartments 214 out of the compartments and into the mixing chamber216.

Simultaneously, the electric motor 234 is activated to drive the stirrer234 to mix the chemical components.

After a predetermined time delay calculated to allow thorough mixing ofthe chemical components, but before substantial foaming takes place, thedetonators 236 are detonated to fracture a panel covering the opening220 in the floor of the mixing chamber 216. Thus, the chemical mixtureis discharged, amplified by pressure generated by the detonation of thedetonators 236, out of the mixing chamber 216 into and over the areabeing secured by the security apparatus 210.

Expansion and solidification of the foam, in a manner similar to whatwas described above, fill the area being secured to prevent entry andexit.

The embodiment of FIGS. 4 and 5 has, as a first additional advantage, amore compact construction in respect of the compartments and mixingchamber. Furthermore, fracturing of the partitions 218 and laterfracturing of the floor 220 of the mixing chamber are effected neatly byway of detonators which are inexpensive to provide, and whichfurthermore generate pressure to enhance discharge of the two chemicalcompounds and later of the chemical mixture.

It is further an advantage that each of the compartments 214 can easilybe charged or replenished via their lids 270.

1. A method of securing an enclosed area against an external threat, themethod including containing, in separate compartments of a compositecontainer, a plurality of predetermined liquid chemical components, thecomponents being adapted, when mixed, in short time, to foam, to expandand to set; selectively mixing, for a predetermined short period, therespective liquid chemical components, mixing including forcefullybreaking a division means in the form of at least one wall of frangiblematerial between the compartments to expose the components to each otheror to intercommunicate the compartments; distributing the mixture whilesubstantially in liquid state and substantially before foamingcommences, over the area; allowing the mixture to foam at leastpartially to occupy the area, to set, and to block the area againstentry or exit.
 2. A method as claimed in claim 1 which includesactuating electrical mixing means to commence mixing, actuatingincluding driving a ram through the division means to break it.
 3. Amethod as claimed in claim 1 which includes actuating a detonatorarranged to fracture the division means and pressurizing a respectivecompartment with pressure generated by the detonator to blow thedivision means out of its position.
 4. A method as claimed in claim 1,in which said separate compartments are adjacent a mixing chamber andare separated from the mixing chamber by respective walls of frangiblematerial, the method including breaking said walls and causing therespective chemical components to flow into the mixing chamber, mixingtaking place within the mixing chamber.
 5. A method as claimed in claim1, which includes mixing the liquid components by stirring.
 6. A methodas claimed in claim 4, which includes mixing the liquid components bystirring, said stirring being in the mixing chamber by means of astirrer.
 7. A method as claimed in claim 1 which includes, after apredetermined time period from the time of actuation, discharging themixture from the container or the mixing chamber by fracturing a wallportion of the container or mixing chamber to distribute the mixtureover the area.
 8. A method as claimed in claim 7 in which the wallportion is fractured by releasing a pre-tensioned spring arranged todrive a fracturing member into said frangible wall portion.
 9. A methodas claimed in claim 7 which includes detonating a detonator arranged tofracture the wall portion.
 10. A method as claimed in claim 9 whichincludes pressurising an area behind the wall portion with pressuregenerated by the detonator and to drive the wall portion from itsposition.
 11. A method as claimed in claim 10 which includes expellingthe liquid mixture from the container or mixing chamber under saidpressure generated by the detonator.
 12. A method as claimed in claim 1which includes hindering or retarding entry into the enclosed area bydeploying a collapsible and extensible barricade member in the form of aroll of barbed or prickled wire in the enclosed area by moving thebarricade member from a collapsed condition in a stowed position to anextended condition in a deployed position in respect of the enclosedarea.
 13. A method as claimed in claim 12 in which mixing the pluralityof liquid chemical components and deploying the barricade member are inresponse to a signal generated by control means.
 14. A method as claimedin claim 13 in which the control means generates said signal in responseto manual actuation or automatically in response to sensing a dangersituation.
 15. A method as claimed in claim 14 in which said enclosedarea is a load area of a vehicle and in which said sensor is arranged tobe triggered by impact.
 16. A securing arrangement suitable for use insecuring an enclosed area against external threat in accordance with themethod of claim 1, the securing arrangement comprising a compositecontainer including separate compartments respectively containing liquidchemical components adapted, when mixed, in short time, to foam, toexpand and to set; division means in the form of at least one wall offrangible material between the compartments which division means isreadily breakable to intercommunicate the compartments; mixing means tomix the liquid chemical components; and control means to cause mixingfor a predetermined period and then to cause the mixture to bedischarged while substantially still in a liquid state prior to foaming.17. A securing arrangement as claimed in claim 16 in which the mixingmeans includes a shaft carrying a stirring head and being drivinglyconnected to a rotary motor.
 18. A securing arrangement as claimed inclaim 17 in which the rotary motor is a direct current electric motor.19. A securing arrangement as claimed in claim 17 in which the shaft isextensible to act as a ram to breach the division means.
 20. A securingarrangement as claimed in claim 19, in which the shaft is in twoportions being interconnected by means of a bendix drive to extend oneportion to act as a ram.
 21. A securing arrangement as claimed in claim16, in which the separate compartments for the respective chemicalliquids are adjacent a mixing chamber and are compartmentalized by meansof frangible division means dividing the compartments and the mixingchamber, the securing arrangement including detonators arranged, whenactuated, to fracture the division means to communicate the compartmentswith the mixing chamber.
 22. A securing arrangement as claimed in claim21 in which the detonators are arranged to pressurize the compartmentsto blow the respective division means out of their positions.
 23. Asecuring arrangement as claimed in claim 22 in which arrangement of therespective compartments adjacent the mixing chamber is such that saiddivision means prevents intercommunication, and such that the respectivecompartments dump their contents into the mixing chamber when thedivision means is fractured and the compartments are pressurized.
 24. Asecuring arrangement as claimed in claim 16 in which the compositecontainer has a discharge gate to discharge the liquid after mixing hastaken place and prior to commencement of substantial foaming, thedischarge gate being in the form of a frangible division in the form ofa wall portion of the container, the securing arrangement includingbreaking means to fracture the division.
 25. A securing arrangement asclaimed in claim 24 in which the breaking means is in the form of aspring biassed lever, which is released by means of the control means.26. A securing arrangement as claimed in claim 24 in which the breakingmeans includes one or more detonators actuable by means of the controlmeans and arranged to fracture the division when actuated.
 27. Asecuring arrangement as claimed in claim 26 in which the detonators arearranged, when actuated, to pressurize the mixing chamber to blow thefractured division out of its position.
 28. A securing arrangement asclaimed in claim 16, in which the enclosed area is a load area of avehicle, in which the control means is triggerable selectively or whenan accident situation arises.
 29. A securing arrangement as claimed inclaim 16 which includes hindering or retarding means suitable for use inhindering or retarding unauthorised entry into the enclosed area, thehindering or retarding means including at least one collapsible andextensible barricade member in the form of a roll of resilient barbed orprickled wire movable between a stowed condition in which the barricademember is stowed in its collapsed condition, and a deployed condition inwhich the barricade member is deployed in its extended condition;deployment means adapted to move the barricade member rapidly from itsstowed to its deployed condition; and a trigger adapted to trigger thedeployment means.
 30. A securing arrangement as claimed in claim 29 inwhich the deployment means is provided at least partially by inherentresilience of the wire.
 31. A securing arrangement as claimed in claim29 in which the deployment means includes resilient bias means to castthe barricade member into a predetermined direction.
 32. A securingarrangement as claimed in claim 31 which includes a shutter arranged tohold the barricade member against resilient bias in its stowedcondition, the trigger being connected to the shutter to open theshutter or to allow the shutter to open.
 33. A securing arrangement asclaimed in claim 29 in which the enclosed area is a load area of avehicle and in which the trigger is a composite trigger allowing manualoperation, and is also automatically operable when an accident situationinvolving the vehicle takes place.
 34. A securing arrangement as claimedin claim 33 which includes an automatic trigger means responsive to highimpact.